test: add initial ruby tests

This is pretty much a line by line translation of the existing python
tests, with two new tests for the count API.

test/T395-ruby.sh

@@ -0,0 +1,86 @@
+#!/usr/bin/env bash
+test_description="ruby bindings"
+. ./test-lib.sh
+
+if [ "${NOTMUCH_HAVE_RUBY_DEV}" = "0" ]; then
+    test_subtest_missing_external_prereq_["ruby development files"]=t
+fi
+
+add_email_corpus
+
+test_begin_subtest "compare thread ids"
+test_ruby <<"EOF"
+require 'notmuch'
+$maildir = ENV['MAIL_DIR']
+if not $maildir then
+  abort('environment variable MAIL_DIR must be set')
+end
+@db = Notmuch::Database.new($maildir)
+@q = @db.query('tag:inbox')
+@q.sort = Notmuch::SORT_OLDEST_FIRST
+for t in @q.search_threads do
+  print t.thread_id, "\n"
+end
+EOF
+notmuch search --sort=oldest-first --output=threads tag:inbox | sed s/^thread:// > EXPECTED
+test_expect_equal_file OUTPUT EXPECTED
+
+test_begin_subtest "compare message ids"
+test_ruby <<"EOF"
+require 'notmuch'
+$maildir = ENV['MAIL_DIR']
+if not $maildir then
+  abort('environment variable MAIL_DIR must be set')
+end
+@db = Notmuch::Database.new($maildir)
+@q = @db.query('tag:inbox')
+@q.sort = Notmuch::SORT_OLDEST_FIRST
+for m in @q.search_messages do
+  print m.message_id, "\n"
+end
+EOF
+notmuch search --sort=oldest-first --output=messages tag:inbox | sed s/^id:// > EXPECTED
+test_expect_equal_file OUTPUT EXPECTED
+
+test_begin_subtest "get non-existent file"
+test_ruby <<"EOF"
+require 'notmuch'
+$maildir = ENV['MAIL_DIR']
+if not $maildir then
+  abort('environment variable MAIL_DIR must be set')
+end
+@db = Notmuch::Database.new($maildir)
+result = @db.find_message_by_filename('i-dont-exist')
+print (result == nil)
+EOF
+test_expect_equal "$(cat OUTPUT)" "true"
+
+test_begin_subtest "count messages"
+test_ruby <<"EOF"
+require 'notmuch'
+$maildir = ENV['MAIL_DIR']
+if not $maildir then
+  abort('environment variable MAIL_DIR must be set')
+end
+@db = Notmuch::Database.new($maildir)
+@q = @db.query('tag:inbox')
+print @q.count_messages(),"\n"
+EOF
+notmuch count --output=messages tag:inbox > EXPECTED
+test_expect_equal_file OUTPUT EXPECTED
+
+test_begin_subtest "count threads"
+test_ruby <<"EOF"
+require 'notmuch'
+$maildir = ENV['MAIL_DIR']
+if not $maildir then
+  abort('environment variable MAIL_DIR must be set')
+end
+@db = Notmuch::Database.new($maildir)
+@q = @db.query('tag:inbox')
+print @q.count_threads(),"\n"
+EOF
+notmuch count --output=threads tag:inbox > EXPECTED
+test_expect_equal_file OUTPUT EXPECTED
+
+test_done

test/test-lib.sh

@@ -1163,6 +1163,11 @@ test_python() {
 		| $cmd -
 }
 
+test_ruby() {
+    export LD_LIBRARY_PATH=$TEST_DIRECTORY/../lib
+    MAIL_DIR=$MAIL_DIR ruby -I $TEST_DIRECTORY/../bindings/ruby> OUTPUT
+}
+
 test_C () {
     exec_file="test${test_count}"
     test_file="${exec_file}.c"